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Arul Prakash S, Sengan M, John ML, Veerappan A, Kamlekar RK. Interaction of N-acyltaurines with phosphatidylcholines. BIOCHIMICA ET BIOPHYSICA ACTA. BIOMEMBRANES 2023; 1865:184103. [PMID: 36563892 DOI: 10.1016/j.bbamem.2022.184103] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/23/2022] [Revised: 12/11/2022] [Accepted: 12/14/2022] [Indexed: 12/24/2022]
Abstract
N-acyltaurines (NATs) are biologically active amphiphilic lipids. They come under the group of compounds known as N-acyl amino acids. NATs were first detected in the brain and other tissues in mice lacking the enzyme fatty acid amide hydrolase FAAH (-/-). N-arachidonoyltaurine (20:4 NAT) acts as an excellent ligand for the subset of transient receptor potential (TRP) channels, especially vanilloid type channels TRPV1 and TRPV4. Also, hydrophobic and hydrophilic regions of NATs enable them to interact with membrane lipids. Here, we have investigated the interaction of NATs, N-myristoyltaurine (NMT), and N-palmitoyltaurine (NPT) with their corresponding diacyl phosphatidylcholines (PCs), dimyristoylphosphatidylcholine (DMPC), and dipalmitoylphosphatidylchoine (DPPC). The miscibility and phase behavior of the hydrated binary mixtures have been investigated by differential scanning calorimetry (DSC). Studies on the interaction of NMT/NPT with DMPC/DPPC revealed that the two amphiphiles mix well up to 50 mol% of NAT and phase separation is observed at higher contents of the NAT. The phase transition of the equimolar mixtures of NAT:PC (50:50) studied by fluorescence, also supported the DSC results. PXRD and FTIR analysis show that the NAT:PC equimolar mixture (50:50) forms different supramolecular structures when compared to that of individual NATs and PCs. From transmission electron microscopic studies it is observed that the equimolar mixtures of NMT and NPT with their corresponding diacylphosphatidylcholines (50:50, mol/mol) forms unilamellar vesicles whose diameter range between 30 and 50 nm.
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Affiliation(s)
- Sukanya Arul Prakash
- Department of Chemistry, School of Advanced Sciences, VIT, Vellore 632014, TN, India
| | - Megarajan Sengan
- Department of Chemistry, Bishop Heber College, Tiruchirappalli 620017, TN, India; Department of Chemistry, School of Chemical and Biotechnology, SASTRA Deemed University, Thanjavur 613401, TN, India
| | - Martin Luther John
- Department of Chemistry, School of Advanced Sciences, VIT, Vellore 632014, TN, India
| | - Anbazhagan Veerappan
- Department of Chemistry, School of Chemical and Biotechnology, SASTRA Deemed University, Thanjavur 613401, TN, India.
| | - Ravi Kanth Kamlekar
- Department of Chemistry, School of Advanced Sciences, VIT, Vellore 632014, TN, India.
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Gasecka P, Balla NK, Sison M, Brasselet S. Lipids-Fluorophores Interactions Probed by Combined Nonlinear Polarized Microscopy. J Phys Chem B 2021; 125:13718-13729. [PMID: 34902969 DOI: 10.1021/acs.jpcb.1c07866] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Studying the structural dynamics of lipid membranes requires methods that can address both microscopic and macroscopic characteristics. Fluorescence imaging is part of the most used techniques to study membrane properties in various systems from artificial membranes to cells: It benefits from a high sensitivity to local properties such as polarity and molecular orientational order, with a high spatial resolution down to the single-molecule level. The influence of embedded fluorescent lipid probes on the lipid membrane molecules is however poorly known and relies most often on molecular dynamics simulations, due to the challenges faced by experimental approaches to address the molecular-scale dimension of this question. In this work we develop an optical microscopy imaging method to probe the effect of fluorophores embedded in the membrane as lipid probes, on their lipid environment, with a lateral resolution of a few hundreds of nanometers. We combine polarized-nonlinear microscopy contrasts that can independently address the lipid probe, by polarized two-photon fluorescence, and the membrane lipids, by polarized coherent Raman scattering. Using trimethylamino derivative 1-(4-trimethylammonium-phenyl)-6-phenyl-1,3,5-hexatriene (TMA-DPH) and di-8-butyl-amino-naphthyl-ethylene-pyridinium-propyl-sulfonate (di-8-ANEPPS) as model probes, we show that both probes tend to induce an orientational disorder of their surrounding lipid CH-bonds in 1,2-dipalmitoylphosphatidylcholine (DPPC) lipids environments, while there is no noticeable effect in more disordered 1,2-dioleoyl-sn-glycero-3-phosphocholine (DOPC) lipid membranes.
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Affiliation(s)
- Paulina Gasecka
- Aix Marseille Univ, CNRS, Centrale Marseille, Institut Fresnel, F-13013 Marseille, France
| | - Naveen K Balla
- Aix Marseille Univ, CNRS, Centrale Marseille, Institut Fresnel, F-13013 Marseille, France
| | - Miguel Sison
- Aix Marseille Univ, CNRS, Centrale Marseille, Institut Fresnel, F-13013 Marseille, France
| | - Sophie Brasselet
- Aix Marseille Univ, CNRS, Centrale Marseille, Institut Fresnel, F-13013 Marseille, France
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Neunert G, Tomaszewska-Gras J, Siejak P, Pietralik Z, Kozak M, Polewski K. Disruptive effect of tocopherol oxalate on DPPC liposome structure: DSC, SAXS, and fluorescence anisotropy studies. Chem Phys Lipids 2018; 216:104-113. [PMID: 30308198 DOI: 10.1016/j.chemphyslip.2018.10.001] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/15/2018] [Revised: 09/26/2018] [Accepted: 10/05/2018] [Indexed: 02/05/2023]
Abstract
α-Tocopherol oxalate (TO), a tocopherol ester derivative, was investigated for its effect on the structural changes of fully hydrated 1,2-dipalmitoyl-sn-glycero-3-phosphocholine (DPPC) liposomes, as a function of concentration and temperature, by applying differential scanning calorimetry (DSC), small angle X-ray scattering (SAXS), and DPH fluorescence anisotropy methods. The DSC and DPH anisotropy data indicated that TO embedded into DPPC membrane lowered the enthalpy (ΔHm) and temperature (Tm) of the main phase transition as well its cooperativity. Fluidization of the membrane at a lowered temperature was accompanied by formation of mixed structures of tocopherol-enriched domains. SAXS studies showed the formation of various ordered structures in DPPC gel-phase during incorporation of TO into the bilayer, as evidenced by the existence of lamellar phases with repeat distances (d) of 6.13 and 6.87 nm, assigned to TO-enriched domains and a lamellar, liquid-ordered DPPC phase with d = 8.45 nm at increasing TO concentrations with lowering and broadening of the Bragg peaks, and diffuse scattering, characteristic of a fluid Lα phase, were observed. In DPPC fluid-phase, the increasing presence of TO at low concentrations resulted in the appearance of a liquid-ordered phase with repeat d = 6.9 nm coexistent with a lamellar structure with d = 9.2 nm, assigned to liquid-disordered structures. An increasing repeat distance observed with raising the TO amount in the DPPC bilayer evolved from an increasing interlamellar water layer of increasing thickness. Presence of TO facilitated penetration of water molecules into the acyl chain region which decreased van der Waals interactions in the bilayer. The DSC, SAXS, and fluorescence anisotropy data established that TO exhibited pronounced disruptive activity in DPPC membranes compared to α-tocopherol. The driving force of the observed action was attributed to electrostatic and dipole interactions of the acidic moiety with the polar head group of phospholipids in the interface region of the bilayer.
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Affiliation(s)
- Grażyna Neunert
- Department of Physics and Biophysics, Faculty of Food and Nutrition Sciences, Poznan University of Life Sciences, Wojska Polskiego 38/42, 60-637, Poznan, Poland
| | - Jolanta Tomaszewska-Gras
- Department of Food Quality Management, Faculty of Food and Nutrition Sciences, Poznan University of Life Sciences, Wojska Polskiego 31/33, 60-624, Poznan, Poland
| | - Przemyslaw Siejak
- Department of Physics and Biophysics, Faculty of Food and Nutrition Sciences, Poznan University of Life Sciences, Wojska Polskiego 38/42, 60-637, Poznan, Poland
| | - Zuzanna Pietralik
- Faculty of Physics, Adam Mickiewicz University, Umultowska 85, 61-614, Poznań, Poland
| | - Maciej Kozak
- Faculty of Physics, Adam Mickiewicz University, Umultowska 85, 61-614, Poznań, Poland
| | - Krzysztof Polewski
- Department of Physics and Biophysics, Faculty of Food and Nutrition Sciences, Poznan University of Life Sciences, Wojska Polskiego 38/42, 60-637, Poznan, Poland.
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Amoako AA, Marczylo TH, Elson J, Taylor AH, Willets JM, Konje JC. Relationship between seminal plasma levels of anandamide congeners palmitoylethanolamide and oleoylethanolamide and semen quality. Fertil Steril 2014; 102:1260-7. [PMID: 25212838 DOI: 10.1016/j.fertnstert.2014.07.767] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/20/2014] [Revised: 07/09/2014] [Accepted: 07/09/2014] [Indexed: 11/25/2022]
Abstract
OBJECTIVE To determine whether changes in seminal plasma concentrations of the endogenous lipid signaling molecules palmitoylethanolamide (PEA) and oleoylethanolamide (OEA) have significant effects on sperm quality. DESIGN Biochemical and physiological studies of human seminal plasma and spermatozoa. SETTING Academic tertiary care medical center. PATIENT(S) Ninety men attending an infertility clinic for semen analysis. INTERVENTION(S) Palmitoylethanolamide and OEA extracted from seminal plasma were quantified by ultra high-performance liquid chromatography (HPLC)-tandem mass spectrometry. Patient sperm from semen with normal parameters were exposed in vitro to PEA or OEA to determine effects on sperm motility, viability, and mitochondrial activity. MAIN OUTCOME MEASURE(S) The relationship between seminal plasma concentrations of PEA and OEA and sperm quality and the effect of these compounds on sperm motility, viability, and mitochondria activity in vitro. RESULT(S) Palmitoylethanolamide and OEA concentrations in seminal plasma were lower in men with asthenozoospermia and oligoasthenoteratozospermia compared with men with normal semen parameters. Palmitoylethanolamide and OEA rapidly and significantly improved sperm motility and maintained viability without affecting mitochondria activity in vitro. CONCLUSION(S) Maintenance of normal PEA and OEA tone in human seminal plasma may be necessary for the preservation of normal sperm function and male fertility. Exocannabinoids found in Cannabis, such as delta-9-tetrahydrocannabinol and cannabidiol, could compete with these endocannabinoids upsetting their finely balanced, normal functioning and resulting in male reproductive failure.
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Affiliation(s)
- Akwasi Atakora Amoako
- Endocannabinoid Research Group, Reproductive Science Section, Department of Cancer Studies and Molecular Medicine, University of Leicester, Leicester, United Kingdom.
| | - Timothy Hywel Marczylo
- Centre for Radiation, Chemical and Environmental Hazards, Health Protection Agency, Didcot, Oxfordshire, United Kingdom
| | | | - Anthony Henry Taylor
- Endocannabinoid Research Group, Reproductive Science Section, Department of Cancer Studies and Molecular Medicine, University of Leicester, Leicester, United Kingdom
| | - Jonathon M Willets
- Endocannabinoid Research Group, Reproductive Science Section, Department of Cancer Studies and Molecular Medicine, University of Leicester, Leicester, United Kingdom
| | - Justin Chi Konje
- Endocannabinoid Research Group, Reproductive Science Section, Department of Cancer Studies and Molecular Medicine, University of Leicester, Leicester, United Kingdom
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Abstract
N-acylethanolamides (NAEs) are naturally occurring signaling lipids consisting of amides and esters of long-chain polyunsaturated fatty acids. Usually they are present in a very small amounts in many mammalian tissues and cells, including human reproductive tracts and fluids. Recently, the presence of N-arachidonoylethanolamide (anandamide, AEA), the most characterised member of endocannabinoids, and its congeners palmitoylethanolamide (PEA) and oleylethanolamide (OEA) in seminal plasma, oviductal fluid, and follicular fluids was demonstrated. AEA has been shown to bind not only type-1 (CB1) and type-2 (CB2) cannabinoid receptors, but also type-1 vanilloid receptor (TRPV1), while PEA and OEA are inactive with respect to classical cannabinoid CB1 and CB2 but activate TRPV1 or peroxisome proliferator activate receptors (PPARs). This review concerns the most recent experimental data on PEA and OEA, endocannabinoid-like molecules which appear to exert their action exclusively on sperm cells with altered features, such as membrane characteristics and kinematic parameters. Their beneficial effects on these cells could suggest a possible pharmacological use of PEA and OEA on patients affected by some forms of idiopathic infertility.
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Ambrosini A, Zolese G, Ambrosi S, Ragni L, Tiano L, Littarru G, Bertoli E, Mantero F, Boscaro M, Balercia G. Oleoylethanolamide protects human sperm cells from oxidation stress: studies on cases of idiopathic infertility. Biol Reprod 2005; 74:659-65. [PMID: 16354794 DOI: 10.1095/biolreprod.105.046060] [Citation(s) in RCA: 28] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/01/2022] Open
Abstract
N-acylethanolamides are naturally occurring hydrophobic molecules usually present in a very small amount in many mammalian tissues and cells. The presence of N-acylethanolamides has also been demonstrated in human reproductive tracts and fluids, although their biological effects and molecular mechanisms of action are not yet completely elucidated. It is known that some N-acylethanolamides, such as oleoylethanolamide, have antioxidative properties. The aim of this study was to test whether oleoylethanolamide could protect sperm cells from reactive oxygen species-induced oxidative damage in cases of idiopathic infertility, because the excessive generation of these radicals was associated with this pathology. Our results show that 2.5 nM oleoylethanolamide in vitro supplementation significantly reduces DNA strand breaks both in fertile and infertile subjects. Moreover, oleoylethanolamide increases kinematic parameters, such as curvilinear velocity and amplitude of lateral head displacement and hyperactivation, both in the presence and in the absence of oxidative stress. Results of this study support the hypothesis of a possible protective action of oleoylethanolamide against reactive oxygen species, which could explain its beneficial effects on in vitro capacitated spermatozoa.
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Affiliation(s)
- Annarina Ambrosini
- Institute of Biochemistry, Polytechnic University of Marche, 60100 Ancona, Italy.
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Ambrosi S, Ragni L, Ambrosini A, Paccamiccio L, Mariani P, Fiorini R, Bertoli E, Zolese G. On the importance of anandamide structural features for its interactions with DPPC bilayers: effects on PLA2 activity. J Lipid Res 2005; 46:1953-61. [PMID: 15961786 DOI: 10.1194/jlr.m500121-jlr200] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
The acylethanolamide anandamide (AEA) occurs in a variety of mammalian tissues and, as a result of its action on cannabinoid receptors, exhibits several cannabimimetic activities. Moreover, some of its effects are mediated through interaction with an ion channel-type vanilloid receptor. However, the chemical features of AEA suggest that some of its biological effects could be related to physical interactions with the lipidic part of the membrane. The present work studies the effect of AEA-induced structural modifications of the dipalmitoylphosphatidylcholine (DPPC) bilayer on phospholipase A2 (PLA2) activity, which is strictly dependent on lipid bilayer features. This study, performed by 2-dimethylamino-(6-lauroyl)-naphthalene fluorescence, demonstrates that the effect of AEA on PLA2 activity is concentration-dependent. In fact, at low AEA/DPPC molar ratios (from R = 0.001 to R = 0.04), there is an increase of the enzymatic activity, which is completely inhibited for R = 0.1. X-ray diffraction data indicate that the AEA affects DPPC membrane structural properties in a concentration-dependent manner. Because the biphasic effect of increasing AEA concentrations on PLA2 activity is related to the induced modifications of membrane bilayer structural properties, we suggest that AEA-phospholipid interactions may be important to produce, at least in part, some of the similarly biphasic responses of some physiological activities to increasing concentrations of AEA.
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Affiliation(s)
- S Ambrosi
- Istituto di Biochimica, Università Politecnica delle Marche, 60131 Ancona, Italy
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8
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Swamy MJ, Ramakrishnan M, Marsh D, Würz U. Miscibility and phase behaviour of binary mixtures of N-palmitoylethanolamine and dipalmitoylphosphatidylcholine. BIOCHIMICA ET BIOPHYSICA ACTA-BIOMEMBRANES 2003; 1616:174-83. [PMID: 14561475 DOI: 10.1016/j.bbamem.2003.08.008] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
Abstract
The content of N-acylethanolamines (NAEs) increases dramatically in cell membranes when the parent organism is subjected to injury or stress. This increase has been attributed to stress-combating mechanisms of the organism. In this study, a binary phase diagram of hydrated mixtures of N-palmitoylethanolamine (NP-E)--an endogenous ligand for the peripheral cannabinoid receptor (CB-2)--with dipalmitoylphosphatidylcholine (DPPC) is established by high-sensitivity differential scanning calorimetry (DSC). The structures of the phases involved were determined by using 31P-NMR spectroscopy and low-angle X-ray scattering. DSC studies show that NP-E and DPPC mix well in the composition range DPPC/NP-E=100:0 to 40:60 (mol/mol). At higher contents of NP-E, phase separation is indicated by the presence of additional transitions in the thermograms. Characterization of the structures formed by the mixtures with 31P-NMR shows that, up to 80 mol% NP-E, DPPC remains in the lamellar phase. The low-angle X-ray diffraction data are also consistent with a lamellar gel-phase structure for DPPC/NP-E mixtures up to 60 mol% NP-E. Above 70 mol% NP-E, NP-E phase separates in the gel-phase region, while complete miscibility is observed in the fluid phase. These results provide a structural basis for understanding the membrane interactions of NAEs, which is necessary for understanding the mechanism of their putative stress-combating role in the parent organisms.
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Affiliation(s)
- Musti J Swamy
- School of Chemistry, University of Hyderabad, Hyderabad 500 046, India.
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Zolese G, Wozniak M, Mariani P, Saturni L, Bertoli E, Ambrosini A. Different modulation of phospholipase A2 activity by saturated and monounsaturated N-acylethanolamines. J Lipid Res 2003; 44:742-53. [PMID: 12562826 DOI: 10.1194/jlr.m200395-jlr200] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
The physiological functions of N-acylethanolamines (NAEs) are poorly understood, although many functions were suggested for these naturally occurring membrane components of plants and animals. The binding with cannabinoid receptors CB1 and CB2 was demonstrated for some NAEs, such as anandamide. However, the chemical nature of these molecules suggests that some of their biological effects on biomembranes could be related, at least partially, to physical interactions with the lipid bilayer. The present work studies the effect of saturated and monounsaturated NAEs on phospholipase A2 (PLA2) activity, which is dependent on lipid bilayer features. The present study, performed by 2-dimethylamino-(6-lauroyl)-naphthalene (Laurdan) fluorescence, demonstrates that the acyl chain length and the presence of a single double bond are crucial for the enzymatic activity modulation by NAEs. In fact, saturated NAEs with 10 carbon atoms don't affect the PLA2 activity, while NAEs with 12 and 16 carbon atoms largely activate the enzyme. On the other hand, an acyl chain length of 18 carbon atoms, with or without the presence of a double bond, only slightly affects the enzymatic activity. A structural model for NAE-lipid interactions is proposed in order to explain the differences in PLA2 activity modulation by these fatty acid derivatives.
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Marsh D, Swamy MJ. Derivatised lipids in membranes. Physico-chemical aspects of N-biotinyl phosphatidylethanolamines, N-acyl phosphatidylethanolamines and N-acyl ethanolamines. Chem Phys Lipids 2000; 105:43-69. [PMID: 10727113 DOI: 10.1016/s0009-3084(99)00132-2] [Citation(s) in RCA: 35] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/16/2022]
Abstract
The physical properties of N-biotinyl phosphatidylethanolamines, N-acyl phosphatidylethanolamines and of N-acyl ethanolamines, in aqueous dispersions, are reviewed. Emphasis is placed on the calorimetric (i.e. chain melting) properties, the thermotropic phase behaviour, certain aspects of the structure and dynamics, and the miscibility with other membrane lipids. In the case of N-biotinyl phosphatidylethanolamines, the specific binding of avidin, and in the case of N-acyl ethanolamines, the function of the third chain, is also considered. All of these properties are relevant to the role of these rather unusual lipids in membranes.
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Affiliation(s)
- D Marsh
- Max-Planck-Institut für biophysikalische Chemie, Abt. Spektroskopie, Göttingen, Germany.
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Ambrosini A, Bossi G, Dante S, Dubini B, Gobbi L, Leone L, Grazia Ponzi Bossi M, Zolese G. Lipid-drug interaction: thermodynamic and structural effects of antimicotic fluconazole on DPPC liposomes. Chem Phys Lipids 1998. [DOI: 10.1016/s0009-3084(98)00062-0] [Citation(s) in RCA: 18] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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12
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Differential scanning calorimetric studies on the thermotropic phase transitions of N-acylethanolamines of odd chainlengths. Chem Phys Lipids 1998. [DOI: 10.1016/s0009-3084(98)00020-6] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Berdyshev EV, Boichot E, Lagente V. Anandamide--a new look on fatty acid ethanolamides. JOURNAL OF LIPID MEDIATORS AND CELL SIGNALLING 1996; 15:49-67. [PMID: 9029374 DOI: 10.1016/s0929-7855(96)00548-2] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/03/2023]
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14
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Abstract
Long-chain N-acylethanolamines (NAEs) elicit a variety of biological and pharmacological effects. Anandamide (20:4n-6 NAE) and other polyunsaturated NAEs bind to the cannabinoid receptor and may thus serve as highly specific lipid mediators of cell signalling. NAEs can be formed by phospholipase D-catalyzed hydrolysis of N-acylethanolamine phospholipids or by direct condensation of ethanolamine and fatty acid. So far, most of the latter biosynthetic activity has been shown to be the reverse reaction of the NAE amidohydrolase that catalyzes NAE degradation. Thus, increasing evidence supports the hypothesis that the N-acylation-phosphodiesterase pathway yields not only saturated-monounsaturated NAEs, but polyunsaturated ones, including anandamide, as well.
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Affiliation(s)
- H H Schmid
- Hormel Institute, University of Minnesota, Austin 55912, USA
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15
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Zolese G, Gabbianelli R, Bertoli E, Wozniak M, Falcioni G. Effect of N-acylethanolamines on trout erythrocytes. Chem Phys Lipids 1995. [DOI: 10.1016/0009-3084(94)02401-p] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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16
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Ambrosini A, Bertoli E, Tanfani F, Wozniak M, Zolese G. The effect of N-acyl ethanolamines on phosphatidylethanolamine phase transitions studied by laurdan generalised polarisation. Chem Phys Lipids 1994; 72:127-34. [PMID: 7954975 DOI: 10.1016/0009-3084(94)90096-5] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/28/2023]
Abstract
The effect of N-lauroylethanolamine (N-LEA) and N-oleoylethanolamine (N-OEA) on the thermal behaviour of fully hydrated egg phosphatidylethanolamine (TPE) was investigated by the steady-state fluorescence of 2-dimethylamino-(6-lauroyl)-naphtalene (laurdan) and 1-(4-trimethylaminophenyl)-6-phenyl-1,3,5-hexatriene (TMA-DPH). The parameter generalised polarisation (GP), calculated by exciting laurdan at 340 and 410 nm, revealed the gel to liquid crystalline lamellar (L alpha) as well as the L alpha to inverse hexagonal (HII) phase transitions of TPE. The L alpha to HII phase transition was not detected in TPE/N-OEA system, probably because of the formation of an intermediate Q224 cubic phase. The formation of Q224 phase in TPE/N-OEA and TPE/N-LEA systems was previously demonstrated by X-ray diffraction, but neither laurdan generalised polarisation nor TMA-DPH steady-state fluorescence anisotropy measurements revealed the presence of this phase. It is suggested that the lack of detection of the cubic phase is probably due to the similarity in dynamic characteristics and hydration levels of phospholipid headgroups in the bilayer and cubic phases.
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Affiliation(s)
- A Ambrosini
- Istituto di Biochimica, Facoltà di Medicina e Chirurgia, Università degli Studi di Ancona, Italy
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